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        <a href=".." >mysql数据类型</a>
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                                <h1 id="mysql-&#x6570;&#x636E;&#x7C7B;&#x578B;">MySQL &#x6570;&#x636E;&#x7C7B;&#x578B;</h1>
<hr>
<p>[TOC]</p>
<p>MySQL&#x4E2D;&#x5B9A;&#x4E49;&#x6570;&#x636E;&#x5B57;&#x6BB5;&#x7684;&#x7C7B;&#x578B;&#x5BF9;&#x4F60;&#x6570;&#x636E;&#x5E93;&#x7684;&#x4F18;&#x5316;&#x662F;&#x975E;&#x5E38;&#x91CD;&#x8981;&#x7684;&#x3002;</p>
<p>MySQL&#x652F;&#x6301;&#x591A;&#x79CD;&#x7C7B;&#x578B;&#xFF0C;&#x5927;&#x81F4;&#x53EF;&#x4EE5;&#x5206;&#x4E3A;&#x4E09;&#x7C7B;&#xFF1A;&#x6570;&#x503C;&#x3001;&#x65E5;&#x671F;/&#x65F6;&#x95F4;&#x548C;&#x5B57;&#x7B26;&#x4E32;(&#x5B57;&#x7B26;)&#x7C7B;&#x578B;&#x3002;</p>
<p>&#x6CE8;&#x610F;</p>
<p>int(M) &#x5728; integer &#x6570;&#x636E;&#x7C7B;&#x578B;&#x4E2D;&#xFF0C;M &#x8868;&#x793A;&#x6700;&#x5927;&#x663E;&#x793A;&#x5BBD;&#x5EA6;&#x3002;</p>
<p>&#x5728; int(M) &#x4E2D;&#xFF0C;M &#x7684;&#x503C;&#x8DDF; int(M) &#x6240;&#x5360;&#x591A;&#x5C11;&#x5B58;&#x50A8;&#x7A7A;&#x95F4;&#x5E76;&#x65E0;&#x4EFB;&#x4F55;&#x5173;&#x7CFB;&#x3002; int(3)&#x3001;int(4)&#x3001;int(8) &#x5728;&#x78C1;&#x76D8;&#x4E0A;&#x90FD;&#x662F;&#x5360;&#x7528; 4 btyes &#x7684;&#x5B58;&#x50A8;&#x7A7A;&#x95F4;&#x3002;&#x8BF4;&#x767D;&#x4E86;&#xFF0C;&#x9664;&#x4E86;&#x663E;&#x793A;&#x7ED9;&#x7528;&#x6237;&#x7684;&#x65B9;&#x5F0F;&#x6709;&#x70B9;&#x4E0D;&#x540C;&#x5916;&#xFF0C;int(M) &#x8DDF; int &#x6570;&#x636E;&#x7C7B;&#x578B;&#x662F;&#x76F8;&#x540C;&#x7684;&#x3002;</p>
<p>&#x7EFC;&#x5408;&#x4E0A;&#x8FF0;&#xFF1A;int&#xFF08;10&#xFF09;&#x8868;&#x793A;&#x7684;&#x662F;&#x6570;&#x636E;&#x663E;&#x793A;&#x7684;&#x957F;&#x5EA6;&#x4E3A;10&#x4F4D;</p>
<h2 id="&#x6570;&#x503C;&#x7C7B;&#x578B;">&#x6570;&#x503C;&#x7C7B;&#x578B;</h2>
<p>MySQL&#x652F;&#x6301;&#x6240;&#x6709;&#x6807;&#x51C6;SQL&#x6570;&#x503C;&#x6570;&#x636E;&#x7C7B;&#x578B;&#x3002;</p>
<p>&#x8FD9;&#x4E9B;&#x7C7B;&#x578B;&#x5305;&#x62EC;&#x4E25;&#x683C;&#x6570;&#x503C;&#x6570;&#x636E;&#x7C7B;&#x578B;(INTEGER&#x3001;SMALLINT&#x3001;DECIMAL&#x548C;NUMERIC)&#xFF0C;&#x4EE5;&#x53CA;&#x8FD1;&#x4F3C;&#x6570;&#x503C;&#x6570;&#x636E;&#x7C7B;&#x578B;(FLOAT&#x3001;REAL&#x548C;DOUBLE PRECISION)&#x3002;</p>
<p>&#x5173;&#x952E;&#x5B57;INT&#x662F;INTEGER&#x7684;&#x540C;&#x4E49;&#x8BCD;&#xFF0C;&#x5173;&#x952E;&#x5B57;DEC&#x662F;DECIMAL&#x7684;&#x540C;&#x4E49;&#x8BCD;&#x3002;</p>
<p>BIT&#x6570;&#x636E;&#x7C7B;&#x578B;&#x4FDD;&#x5B58;&#x4F4D;&#x5B57;&#x6BB5;&#x503C;&#xFF0C;&#x5E76;&#x4E14;&#x652F;&#x6301;MyISAM&#x3001;MEMORY&#x3001;InnoDB&#x548C;BDB&#x8868;&#x3002;</p>
<p>&#x4F5C;&#x4E3A;SQL&#x6807;&#x51C6;&#x7684;&#x6269;&#x5C55;&#xFF0C;MySQL&#x4E5F;&#x652F;&#x6301;&#x6574;&#x6570;&#x7C7B;&#x578B;TINYINT&#x3001;MEDIUMINT&#x548C;BIGINT&#x3002;&#x4E0B;&#x9762;&#x7684;&#x8868;&#x663E;&#x793A;&#x4E86;&#x9700;&#x8981;&#x7684;&#x6BCF;&#x4E2A;&#x6574;&#x6570;&#x7C7B;&#x578B;&#x7684;&#x5B58;&#x50A8;&#x548C;&#x8303;&#x56F4;&#x3002;</p>
<table>
<thead>
<tr>
<th>&#x7C7B;&#x578B;</th>
<th>&#x5927;&#x5C0F;</th>
<th>&#x8303;&#x56F4;&#xFF08;&#x6709;&#x7B26;&#x53F7;&#xFF09;</th>
<th>&#x8303;&#x56F4;&#xFF08;&#x65E0;&#x7B26;&#x53F7;&#xFF09;</th>
<th>&#x7528;&#x9014;</th>
</tr>
</thead>
<tbody>
<tr>
<td>TINYINT</td>
<td>1 &#x5B57;&#x8282;</td>
<td>(-128&#xFF0C;127)</td>
<td>(0&#xFF0C;255)</td>
<td>&#x5C0F;&#x6574;&#x6570;&#x503C;</td>
</tr>
<tr>
<td>SMALLINT</td>
<td>2 &#x5B57;&#x8282;</td>
<td>(-32 768&#xFF0C;32 767)</td>
<td>(0&#xFF0C;65 535)</td>
<td>&#x5927;&#x6574;&#x6570;&#x503C;</td>
</tr>
<tr>
<td>INT&#x6216;INTEGER</td>
<td>4 &#x5B57;&#x8282;</td>
<td>(-2 147 483 648&#xFF0C;2 147 483 647)</td>
<td>(0&#xFF0C;4 294 967 295)</td>
<td>&#x5927;&#x6574;&#x6570;&#x503C;</td>
</tr>
<tr>
<td>BIGINT</td>
<td>8&#x5B57;&#x8282;</td>
<td>(-9 233 372 036 854 775 808&#xFF0C;9 223 372 036 854 775 807)</td>
<td>(0&#xFF0C;18 446 744 073 709 551 615)</td>
<td>&#x6781;&#x5927;&#x6574;&#x6570;&#x503C;</td>
</tr>
<tr>
<td>FLOAT</td>
<td>4 &#x5B57;&#x8282;</td>
<td>(-3.402 823 466 E+38&#xFF0C;1.175 494 351 E-38)&#xFF0C;0&#xFF0C;(1.175 494 351 E-38&#xFF0C;3.402 823 466 351 E+38)</td>
<td>0&#xFF0C;(1.175 494 351 E-38&#xFF0C;3.402 823 466 E+38)</td>
<td>&#x5355;&#x7CBE;&#x5EA6;&#x6D6E;&#x70B9;&#x6570;&#x503C;</td>
</tr>
<tr>
<td>DOUBLE</td>
<td>8 &#x5B57;&#x8282;</td>
<td>(1.797 693 134 862 315 7 E+308&#xFF0C;2.225 073 858 507 201 4 E-308)&#xFF0C;0&#xFF0C;(2.225 073 858 507 201 4 E-308&#xFF0C;1.797 693 134 862 315 7 E+308)</td>
<td>0&#xFF0C;(2.225 073 858 507 201 4 E-308&#xFF0C;1.797 693 134 862 315 7 E+308)</td>
<td>&#x53CC;&#x7CBE;&#x5EA6;&#x6D6E;&#x70B9;&#x6570;&#x503C;</td>
</tr>
<tr>
<td>DECIMAL</td>
<td>&#x5BF9;DECIMAL(M,D) &#xFF0C;&#x5982;&#x679C;M&gt;D&#xFF0C;&#x4E3A;M+2&#x5426;&#x5219;&#x4E3A;D+2</td>
<td>&#x4F9D;&#x8D56;&#x4E8E;M&#x548C;D&#x7684;&#x503C;</td>
<td>&#x4F9D;&#x8D56;&#x4E8E;M&#x548C;D&#x7684;&#x503C;</td>
<td>&#x5C0F;&#x6570;&#x503C;</td>
</tr>
</tbody>
</table>
<h2 id="&#x65E5;&#x671F;&#x548C;&#x65F6;&#x95F4;&#x7C7B;&#x578B;">&#x65E5;&#x671F;&#x548C;&#x65F6;&#x95F4;&#x7C7B;&#x578B;</h2>
<p>&#x8868;&#x793A;&#x65F6;&#x95F4;&#x503C;&#x7684;&#x65E5;&#x671F;&#x548C;&#x65F6;&#x95F4;&#x7C7B;&#x578B;&#x4E3A;DATETIME&#x3001;DATE&#x3001;TIMESTAMP&#x3001;TIME&#x548C;YEAR&#x3002;</p>
<p>&#x6BCF;&#x4E2A;&#x65F6;&#x95F4;&#x7C7B;&#x578B;&#x6709;&#x4E00;&#x4E2A;&#x6709;&#x6548;&#x503C;&#x8303;&#x56F4;&#x548C;&#x4E00;&#x4E2A;&quot;&#x96F6;&quot;&#x503C;&#xFF0C;&#x5F53;&#x6307;&#x5B9A;&#x4E0D;&#x5408;&#x6CD5;&#x7684;MySQL&#x4E0D;&#x80FD;&#x8868;&#x793A;&#x7684;&#x503C;&#x65F6;&#x4F7F;&#x7528;&quot;&#x96F6;&quot;&#x503C;&#x3002;</p>
<p>TIMESTAMP&#x7C7B;&#x578B;&#x6709;&#x4E13;&#x6709;&#x7684;&#x81EA;&#x52A8;&#x66F4;&#x65B0;&#x7279;&#x6027;&#xFF0C;&#x5C06;&#x5728;&#x540E;&#x9762;&#x63CF;&#x8FF0;&#x3002;</p>
<p>&#x7C7B;&#x578B;&#x5927;&#x5C0F;(&#x5B57;&#x8282;)&#x8303;&#x56F4;&#x683C;&#x5F0F;&#x7528;&#x9014;DATE31000-01-01/9999-12-31YYYY-MM-DD&#x65E5;&#x671F;&#x503C;TIME3&apos;-838:59:59&apos;/&apos;838:59:59&apos;HH:MM:SS&#x65F6;&#x95F4;&#x503C;&#x6216;&#x6301;&#x7EED;&#x65F6;&#x95F4;YEAR11901/2155YYYY&#x5E74;&#x4EFD;&#x503C;DATETIME81000-01-01 00:00:00/9999-12-31 23:59:59YYYY-MM-DD HH:MM:SS&#x6DF7;&#x5408;&#x65E5;&#x671F;&#x548C;&#x65F6;&#x95F4;&#x503C;TIMESTAMP81970-01-01 00:00:00/2037 &#x5E74;&#x67D0;&#x65F6;YYYYMMDD HHMMSS&#x6DF7;&#x5408;&#x65E5;&#x671F;&#x548C;&#x65F6;&#x95F4;&#x503C;&#xFF0C;&#x65F6;&#x95F4;&#x6233;</p>
<h2 id="&#x5B57;&#x7B26;&#x4E32;&#x7C7B;&#x578B;">&#x5B57;&#x7B26;&#x4E32;&#x7C7B;&#x578B;</h2>
<p>&#x5B57;&#x7B26;&#x4E32;&#x7C7B;&#x578B;&#x6307;CHAR&#x3001;VARCHAR&#x3001;BINARY&#x3001;VARBINARY&#x3001;BLOB&#x3001;TEXT&#x3001;ENUM&#x548C;SET&#x3002;&#x8BE5;&#x8282;&#x63CF;&#x8FF0;&#x4E86;&#x8FD9;&#x4E9B;&#x7C7B;&#x578B;&#x5982;&#x4F55;&#x5DE5;&#x4F5C;&#x4EE5;&#x53CA;&#x5982;&#x4F55;&#x5728;&#x67E5;&#x8BE2;&#x4E2D;&#x4F7F;&#x7528;&#x8FD9;&#x4E9B;&#x7C7B;&#x578B;&#x3002;</p>
<p>&#x7C7B;&#x578B;&#x5927;&#x5C0F;&#x7528;&#x9014;CHAR0-255&#x5B57;&#x8282;&#x5B9A;&#x957F;&#x5B57;&#x7B26;&#x4E32;VARCHAR0-255&#x5B57;&#x8282;&#x53D8;&#x957F;&#x5B57;&#x7B26;&#x4E32;TINYBLOB0-255&#x5B57;&#x8282;&#x4E0D;&#x8D85;&#x8FC7; 255 &#x4E2A;&#x5B57;&#x7B26;&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x5B57;&#x7B26;&#x4E32;TINYTEXT0-255&#x5B57;&#x8282;&#x77ED;&#x6587;&#x672C;&#x5B57;&#x7B26;&#x4E32;BLOB0-65 535&#x5B57;&#x8282;&#x4E8C;&#x8FDB;&#x5236;&#x5F62;&#x5F0F;&#x7684;&#x957F;&#x6587;&#x672C;&#x6570;&#x636E;TEXT0-65 535&#x5B57;&#x8282;&#x957F;&#x6587;&#x672C;&#x6570;&#x636E;MEDIUMBLOB0-16 777 215&#x5B57;&#x8282;&#x4E8C;&#x8FDB;&#x5236;&#x5F62;&#x5F0F;&#x7684;&#x4E2D;&#x7B49;&#x957F;&#x5EA6;&#x6587;&#x672C;&#x6570;&#x636E;MEDIUMTEXT0-16 777 215&#x5B57;&#x8282;&#x4E2D;&#x7B49;&#x957F;&#x5EA6;&#x6587;&#x672C;&#x6570;&#x636E;LOGNGBLOB0-4 294 967 295&#x5B57;&#x8282;&#x4E8C;&#x8FDB;&#x5236;&#x5F62;&#x5F0F;&#x7684;&#x6781;&#x5927;&#x6587;&#x672C;&#x6570;&#x636E;LONGTEXT0-4 294 967 295&#x5B57;&#x8282;&#x6781;&#x5927;&#x6587;&#x672C;&#x6570;&#x636E;</p>
<p>CHAR&#x548C;VARCHAR&#x7C7B;&#x578B;&#x7C7B;&#x4F3C;&#xFF0C;&#x4F46;&#x5B83;&#x4EEC;&#x4FDD;&#x5B58;&#x548C;&#x68C0;&#x7D22;&#x7684;&#x65B9;&#x5F0F;&#x4E0D;&#x540C;&#x3002;&#x5B83;&#x4EEC;&#x7684;&#x6700;&#x5927;&#x957F;&#x5EA6;&#x548C;&#x662F;&#x5426;&#x5C3E;&#x90E8;&#x7A7A;&#x683C;&#x88AB;&#x4FDD;&#x7559;&#x7B49;&#x65B9;&#x9762;&#x4E5F;&#x4E0D;&#x540C;&#x3002;&#x5728;&#x5B58;&#x50A8;&#x6216;&#x68C0;&#x7D22;&#x8FC7;&#x7A0B;&#x4E2D;&#x4E0D;&#x8FDB;&#x884C;&#x5927;&#x5C0F;&#x5199;&#x8F6C;&#x6362;&#x3002;</p>
<p>BINARY&#x548C;VARBINARY&#x7C7B;&#x7C7B;&#x4F3C;&#x4E8E;CHAR&#x548C;VARCHAR&#xFF0C;&#x4E0D;&#x540C;&#x7684;&#x662F;&#x5B83;&#x4EEC;&#x5305;&#x542B;&#x4E8C;&#x8FDB;&#x5236;&#x5B57;&#x7B26;&#x4E32;&#x800C;&#x4E0D;&#x8981;&#x975E;&#x4E8C;&#x8FDB;&#x5236;&#x5B57;&#x7B26;&#x4E32;&#x3002;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;&#x5B83;&#x4EEC;&#x5305;&#x542B;&#x5B57;&#x8282;&#x5B57;&#x7B26;&#x4E32;&#x800C;&#x4E0D;&#x662F;&#x5B57;&#x7B26;&#x5B57;&#x7B26;&#x4E32;&#x3002;&#x8FD9;&#x8BF4;&#x660E;&#x5B83;&#x4EEC;&#x6CA1;&#x6709;&#x5B57;&#x7B26;&#x96C6;&#xFF0C;&#x5E76;&#x4E14;&#x6392;&#x5E8F;&#x548C;&#x6BD4;&#x8F83;&#x57FA;&#x4E8E;&#x5217;&#x503C;&#x5B57;&#x8282;&#x7684;&#x6570;&#x503C;&#x503C;&#x3002;</p>
<p>BLOB&#x662F;&#x4E00;&#x4E2A;&#x4E8C;&#x8FDB;&#x5236;&#x5927;&#x5BF9;&#x8C61;&#xFF0C;&#x53EF;&#x4EE5;&#x5BB9;&#x7EB3;&#x53EF;&#x53D8;&#x6570;&#x91CF;&#x7684;&#x6570;&#x636E;&#x3002;&#x6709;4&#x79CD;BLOB&#x7C7B;&#x578B;&#xFF1A;TINYBLOB&#x3001;BLOB&#x3001;MEDIUMBLOB&#x548C;LONGBLOB&#x3002;&#x5B83;&#x4EEC;&#x53EA;&#x662F;&#x53EF;&#x5BB9;&#x7EB3;&#x503C;&#x7684;&#x6700;&#x5927;&#x957F;&#x5EA6;&#x4E0D;&#x540C;&#x3002;</p>
<p>&#x6709;4&#x79CD;TEXT&#x7C7B;&#x578B;&#xFF1A;TINYTEXT&#x3001;TEXT&#x3001;MEDIUMTEXT&#x548C;LONGTEXT&#x3002;&#x8FD9;&#x4E9B;&#x5BF9;&#x5E94;4&#x79CD;BLOB&#x7C7B;&#x578B;&#xFF0C;&#x6709;&#x76F8;&#x540C;&#x7684;&#x6700;&#x5927;&#x957F;&#x5EA6;&#x548C;&#x5B58;&#x50A8;&#x9700;&#x6C42;&#x3002; </p>
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